## Answers

A)h=30, solve for t

30=-5t^2+25t

5(t^2-5t+6)=0

5(t-3)(t-2)=0

t=2 (ball going up) or

t=3 (ball going down)

b) h=0, solve for t

0=-5t^2+25t

5t(5-t)=0

t=0 or t=5

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